5'-O-(4,4'-dimethoxytrityl)-3'-O-(t-butyldimethylsilyl)-2'-deoxythymidine   、                                                                                      7-iodoheptyl phenoxyacetate                                                                                                                                                              在
                                                                                                                                                                                 
1,8-二氮杂双环[5.4.0]十一碳-7-烯                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                                                        以80%的产率得到Phenoxy-acetic acid 7-{3-[(2R,4S,5R)-5-[bis-(4-methoxy-phenyl)-phenyl-methoxymethyl]-4-(tert-butyl-dimethyl-silanyloxy)-tetrahydro-furan-2-yl]-5-methyl-2,6-dioxo-3,6-dihydro-2H-pyrimidin-1-yl}-heptyl ester